Granted Patent
Utility
US 6,434,996 · App. 09/095,813
Punch assembly for forming a base in a metal beverage can
Inventors:
Anton A. Aschberger, Ralph J. Trnka, Robert A. Winkless
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Jun 11, 1998
Inventors
Anton A. Aschberger
Ralph J. Trnka
Robert A. Winkless
Assignee (at issue)
Crown Cork & Seal Technologies Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.